Characterization of Steady-State Current Ripple in Interleaved Power Converters Under Inductance Mismatches

ANTOSZCZUK, P.; GARCIA RETEGUI, R.A.; WASSINGER, N.; MAESTRI, S.; FUNES, M.A.; BENEDETTI, M.

IEEE TRANSACTIONS ON POWER ELECTRONICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2014 vol. 29 p. 1840 - 1849

0885-8993

Interleaved power converters are used in highcurrent applications due to their inherent reduction of semiconductors stress and total ripple. Ripple reduction is accomplished by a correct phase-shifting, and the filtering improvement explained by the increase in ripple frequency. However, these benefits are wasted, among other reasons, by the mismatch of the phase inductor value. As a consequence, differences in ripple amplitude among phases are produced, leading to a total current ripple significantly greater than the ideal case, the loss of the cancelation points and the generation of the switching frequency component and its harmonics. The works dealing with this subject matter have focused on particular cases, such as a given number of phases, a specific converter topology or a particular case of inductance mismatch, disregarding a general analytical approach. This work proposes an analytical method to characterize the total ripple in steady-state as a function of the duty cycle and the number of phases under any condition on inductance mismatch. Experimental results validate the proposed method.